from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun The modified anal fin of the male of certain fishes, such as guppies, used to transfer sperm into the female.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun ichthyology A modified
anal finof certain types of fish that can be used for reproduction
from The American Heritage® Dictionary of the English Language, 4th Edition
[New Latin : gono– + Greek pous, pod-, foot; see podium.]
That does not exclude males with an average-sized sex organ, called a gonopodium.
Come to think of it, there probably should be "gonopodium faculty."